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This is about extinct reptiles, although not dinosaurs:

Most of what I have seen about mesosaurs has them grouped with anapsids.  
However, I have also seen opinions expressed about them being synapids.  
Then there are those who can't decide.  Apparently the temporal region of 
the skulls are not well preserved.  Does anyone know if anything been 
found recently to resolve this issue? 

Norman R. King                                       tel:  (812) 464-1794
Department of Geosciences                            fax:  (812) 464-1960
University of Southern Indiana
8600 University Blvd.
Evansville, IN 47712                      e-mail:  nking.ucs@smtp.usi.edu